You've done the hard part and qualified for Boston...but what wave and corral will you be in? Thanks to folks like Greg Maclin at MyMarathonPace.com who study the numbers religiously, you can get a pretty good idea with his chart.
It's fascinating to see how little time separates those in the second and third waves...a minute here or there could be the difference of 1,000 on your number.
For 2017, you'll likely get your official number in early March. Fingers crossed!